The Data Field - Danfoss VLT DriveMotor FCP 106 Programming Manual

RS485 Installation and Set-...

3.4.6 The Data Field

The structure of data blocks depends on the type of telegram. There are 3 telegram types, and the type applies for both
control telegrams (master⇒slave) and response telegrams (slave⇒master).
3 3
The 3 types of telegram are:
Process block (PCD)
The PCD is made up of a data block of 4 bytes (2 words) and contains:
•
Control word and reference value (from master to slave).
•
Status word and present output frequency (from slave to master).
STX LGE
Illustration 3.7 Process Block
Parameter block
The parameter block is used to transfer parameters between master and slave. The data block is made up of 12 bytes (6
words) and also contains the process block.
STX LGE
Illustration 3.8 Parameter Block
Text block
The text block is used to read texts via the data block.
STX LGE
Illustration 3.9 Text Block
20
®
VLT
ADR PCD1
ADR PKE IND
ADR PKE IND Ch1
Danfoss A/S © 11/2015 All rights reserved.
DriveMotor FCP 106/FCM 106
PWE PWE
high low
Ch2 Chn
PCD2
PCD1 PCD2
PCD1 PCD2
BCC
BCC
BCC
MG03N202